But Israeli officials rejected the findings on Wednesday. They said that the people who had compiled the report had never asked them about the cases, that Israeli officials had no records of entry permits being sought in some of the cases and that details of other cases were inaccurate. Israeli officials also said that the number of Gazans admitted to Israel for advanced medical treatment was increasing.

The report, released Tuesday by the W.H.O., the United Nations health authority, and covering October through March, says that in some cases permits to enter Israel had been late, while other applicants had been denied permits on security grounds. In five cases, the reason given for the delay was a lack of available hospital beds.

Most of the report was based on interviews in Gaza with relatives of the dead, and with Palestinian medical workers and other Palestinian officials.

The report points to the turmoil in the Gaza Strip and bureaucratic staff changes there as factors hampering access to urgent health care. But Dr. Ambrogio Manenti, the director of the World Health Organization office for the West Bank and Gaza Strip, focused on the effects of the Israeli border closing in presenting the report and said the cases it described were illustrations of “nonsense, inhumanity and, at the end, tragedies” that “could have and should have been avoided.”

Israel has restricted movement in and out of Gaza, where only limited health care is available, since the militant Islamic group Hamas took over last June, but says it makes exceptions for humanitarian cases daily.

In 2007, more than 7,000 patients received permits to enter Israel for care, many more than the 4,900 in 2006, said the W.H.O. and the Israeli Coordination and Liaison Administration, which manages movement at the Gaza border crossings. But 18.5 percent of permit applications were denied in 2007, compared with fewer than 10 percent in 2006.

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Gaza’s border with Egypt was closed in June 2007, after the Hamas takeover, leaving Israel as the only option for most patients seeking advanced care. The liaison administration says that more than 2,300 patients entered Israel in the first quarter of 2008.

The report details five case studies, including that of Amir al-Yazji, 9, who contracted meningoencephalitis and died in a Gaza hospital on Nov. 19. Amir fell ill on Nov. 5, the report says his family reported, and his condition was diagnosed days later. Shaher Yazji, his father, described a desperate race against time from Nov. 14, when he got an urgent referral from Gaza for an Israeli hospital, until the Israelis processed the entry permit on Nov. 18, the report says.

Mr. Yazji says in the report that when full approval came through that afternoon for the boy and the medics who would accompany him to the Erez crossing, they were told they would have to arrive within 15 minutes, before the liaison office closed. But transferring Amir to an ambulance and the trip to the checkpoint took at least an hour, so it was put off a day, the report says. Amir died the next morning, it says.

In a written statement on Wednesday, Col. Nir Press, who leads the Israeli Coordination and Liaison Administration for the Gaza crossings, said that his office received the request for Amir on Nov. 18 and gave final approval that day. He said the boy’s departure from Gaza had been delayed a day at the Palestinians’ request because his condition had deteriorated and needed to be stabilized before he could travel. A spokesman for Colonel Press denied that Amir had been given 15 minutes to arrive.

Colonel Press added that among the other 31 deaths the report listed were patients who were unknown to the Israelis, with no request having been received on their behalf.

A version of this article appears in print on , on Page A10 of the New York edition with the headline: Israel Slow to Admit Gaza Patients, U.N. Says. Order Reprints|Today's Paper|Subscribe